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Reinsurance - Components of Net Realized Capital Gains (Losses) on Funds Withheld Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reinsurance
Net realized capital gains (losses)	$ (62.1)	$ (257.9)	$ (263.1)
Fixed maturities, available-for-sale
Reinsurance
Net realized capital gains (losses)	(60.5)	(229.7)	(235.5)
Fixed maturities, trading
Reinsurance
Net realized capital gains (losses)		(0.1)	(6.4)
Equity securities
Reinsurance
Net realized capital gains (losses)		(1.2)	(2.4)
Mortgage loans
Reinsurance
Net realized capital gains (losses)	(1.8)	(34.1)	(24.8)
Derivatives
Reinsurance
Net realized capital gains (losses)	$ 0.2	$ 7.2	2.7
Other
Reinsurance
Net realized capital gains (losses)			$ 3.3

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- Definition

Amount of the realized capital gains (losses) on reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

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